Motor construction



Patented Nov. 29, 1927.

PATENT OFFICE.

T. JANET'IE, OF CHICAGO, ILLINOIS.

MOTOR CONSTRUCTION,

.Application filed, December l5, 1924.

lhile certain features of this invention may be utilized for generalpurposes, it is more particularly directed to motors of thc typeoperated by alternating current. Herctofore, such motors have usuallybeen constructed with cast frames in which the stators are mounted.These frames must 'be made comparativelyA heavy and require aconsiderable amount of machining in order to properly finish the sameand to provide suitable means for attaching the stators. Instead of suchcast frame, the present invention provides a frame made of sheet metalor the like and means for readily mounting the stators therein.

Among the objects of this invention are to provide an improvedalternating current motor construction; to provide an electric apparatusof the motor or generator type with a frame formed of sheet metal; toprovide means for centering and mounting` a stator in a tubular frame orsupport; and in general, to provide such features of construction aswill appear more fully hereinafter.

In the accompanying drawings illustrating a preferred form of thisinvention, Figure l is a side view with parts broken away to show theinterior construction; and

Figure 2 is an end view also with parts broken away.

The stator 3 or non-rotatable portion of the motor may be of anyordinary or preferred form of construction and is shown as being builtup `of laminations in the usual manner. My improved frame 4e whichsupports the stator is made of drawn or sheet metal or preferably sheetsteel and of tubir lar or cylindrical shape as shown. In order tocheapen the construction, as well as for other purposes which willpresently appear` I prefer to make a frame of a fiat strip of steel andpunch or roll the same into the form desired.

The ends 5 of theblank from which the frame is formed are provided withundercut recesses G for receiving a key 'r' which is substantiallyV-shaped at the ends in order to fit in the adjacent recesses to lockthe parts together, The key 7 is secured to a splice or inner strip 8 bymeans `of a rivet 9 or in any other suitable manner. The splice orreenforcing strip 8 engagesclosely with the adjacent ends of the band orring 4 and is secured thereto by means of rivets l0.

The stator 3 has longitudinal grooves .1l

Serial No. 755,959.

in its outer surface for receiving studs or spacing members l2 which areused for hold ing it in position in the frame 4L. lVhile I have shownfour of these studs, which is sufficient for a small motor, any desirednumber may be used. These studs or spacing members are conveniently madefrom cold rolled steel rods and are tapped at the ends for receivingscrews for holding the end frames (not shown). The splice plate, orreenforcing strip 8 is made of proper length so that two of the studs orpins 12 will engage with the ends thereof, as clearly shown in Figure 2.It is desirable to have the stators always positioned in the samerelative circumferential location with respect to the split in the framet so that the splices 8 serve as a convenient means for properlylocating the stators. Furthermore, the ends of these splices provideabutments to prevent any possibility of rotation or circumferentialmovement of the stators in the frames. The ends of the pins or studs l2are preferably slightly tapered, as shown at 13, for convenience indriving them into position. The parts may be arranged so that the pinsor studs will have a comparatively tight lit and the frame 4t, which iscomparatively thin, will yield sufficiently to permit the pins to bedriven into position and will hold them firmly in place.

It will be seen that my improved motor construction provides anexceedingly light frame which may be cheaply made and which requires nofinishing. Furthermore, as the pins or studs l2 occupy but little room,ample Ventilating space is provided between the stator and the frame andas the material of the frame is a good conductor of heat, it will assistin keeping the motor properly cooled.

Various changes may be made in the details of construction andarrangement of parts in order to adapt the motor for differentconditions or for dierent sizes and therefore I do not wish to belimited to the exact construction or arrangement herein set forth,except as specified in the following claims:

l. A frame member of the character set forth, comprising a ring formedof a single strip of sheet metal having undercut recesses in the endsthereof, a key fitting in said recesses and a splice engaging with thekey and the adjacent ends of the ring.

2. In a motor construction, the combination With a stator havinglongitudinal grooves in its outer surface, of a frame comprising` aringl formed of sheet steel with a splice connecting the ends thereofand studs interposed between the stator and the ring, said studs ttingvin said grooves, two of said studs engaging with the ends of the splice.

3. A motor Construction eomprising' a resilient ring, a stator mountedin said ring', spacing;l members inserted bet-Ween the stator and theringr and adapted to eentralize the stator within the ring. said ringhaving an abutment 'for engagement with one or more of the spacingmembers for preventing' rotary movement thereof, and the stator havingrecesses for receiving said spacing members.

4. In a motor construction, the combination of a resilient annular framemember having an abutment on its inner surface, a stator, and pinsinserted between the stator and frame member for eentralizingr thestator, one or more oit said pins engaging with said abutment to holdthe stator from turning` in the iframe member.

The combination of a resilient annular frame member, a splice connectingthe ends oil'v said member, a stator having lonfgitudi nal groovestherein and pins engaging with the grooves in the stator and the framemember, two ot said pins engaging' With the ends ei said splice forpreventing rotation of the stator in the trame, said pins having holesin the ends thereof for securing end frame members therettnsubstantially as described.

JOHN T. JANETTE.

